This documentation page covers how to extend the disk space in the OVA: 
http://docs.graylog.org/en/2.1/pages/configuration/graylog_ctl.html#extend-disk-space

Please note that Graylog's journal is sometimes corrupted when it ran out of 
disk space. In that case you may need to delete the journal folder.

Regards,
Edmundo

> On 28 Dec 2016, at 16:04, [email protected] wrote:
> 
> Thank you Edmundo.
> 
> It appears we ran out of space.
> 
> df -h
> Filesystem      Size  Used Avail Use% Mounted on
> udev            1.5G  4.0K  1.5G   1% /dev
> tmpfs           300M  388K  300M   1% /run
> /dev/dm-0        15G   15G     0 100% /
> none            4.0K     0  4.0K   0% /sys/fs/cgroup
> none            5.0M     0  5.0M   0% /run/lock
> none            1.5G     0  1.5G   0% /run/shm
> none            100M     0  100M   0% /run/user
> /dev/sda1       236M  121M  103M  55% /boot
> 
> We don't mind loosing all the history, we just want the server up and 
> running. If the space available can be extended even better (keep in mind 
> this is OVA). Any suggestions?
> 
> On Wednesday, December 28, 2016 at 9:18:24 AM UTC+1, Edmundo Alvarez wrote:
> Hello, 
> 
> I would start by looking into your logs in /var/log/graylog, specially those 
> in the "server" folder, which may give you some errors to start debugging the 
> issue. 
> 
> Hope that helps. 
> 
> Regards, 
> Edmundo 
> 
> > On 27 Dec 2016, at 20:55, [email protected] wrote: 
> > 
> > We've been using Graylog OVA 2.1 for a while now, but it stopped working 
> > all of the sudden. 
> > 
> > We're getting: 
> > 
> >  Server currently unavailable 
> > We are experiencing problems connecting to the Graylog server running on 
> > https://graylog:443/api. Please verify that the server is healthy and 
> > working correctly. 
> > You will be automatically redirected to the previous page once we can 
> > connect to the server. 
> > Do you need a hand? We can help you. 
> > Less details 
> > This is the last response we received from the server: 
> > Error message 
> > cannot GET https://graylog:443/api/system/cluster/node (500) 
> > 
> > 
> > ubuntu@graylog:~$ sudo graylog-ctl status 
> > run: elasticsearch: (pid 32780) 74s; run: log: (pid 951) 10764s 
> > down: etcd: 0s, normally up, want up; run: log: (pid 934) 10764s 
> > run: graylog-server: (pid 33146) 35s; run: log: (pid 916) 10764s 
> > down: mongodb: 0s, normally up, want up; run: log: (pid 924) 10764s 
> > run: nginx: (pid 32974) 57s; run: log: (pid 914) 10764s 
> > 
> > 
> > How can we begin to troubleshoot the issue, which logs to view...? 
> > 
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> > For more options, visit https://groups.google.com/d/optout. 
> 
> 
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